Picture of Lock your computer CPU with Handheld Key
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Prevent unauthorized access to ur PC by keeping ur CPU locked at home or office.

Follow the simple steps,

Level: Beginner

Tools Required
1.Key operated switch (50INR 1USD)
2. Jumper wires (From Scrap)
3. Terminal Connector (From Scrap)

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Step 1: Drilling and Connections

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Open ur Cabinet cover.
Take apart ur FDD closure, make a hole with ur solder iron.
Attach the Key operated switch with the wire hanging inside the CPU.
Put back the FDD closure

Find the figures

Step 2: Making Connections

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Connect one of ur terminal CPU switch to one terminal of Key switch via a small jumper wire

Use ur soldering techniques

Step 3: Connecting to Motherboard

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Find the exact PowerSW terminal in MBD and connect the rest two terminals to that corresponding MBD SW

Step 4: BIOS Confiure to keep in Stay OFF mode

Picture of BIOS Confiure to keep in Stay OFF mode
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Configure BIOS by pressing DEL,F2 key (depends on ur PC)
Goto power options
Change After Power Failure to STAY OFF

This is used to keep ur PC switched off even when the electricity goes off
Still u need Key to switch the PC back on

Step 5: Finish

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Put ur CPU Cabinet Cover back lock and screw it which cannot be opened.

Operate the Keyswitch then ur Power Button to Switch On

That's it ready to go?
DevTheHam2 months ago
nice idea. I'm thinking of doing that to my new computer I just built.
Using a soldering iron to melt a hole is just stupid
actionjksn2 years ago
Are you referring to the computer tower or the on-off switch as a CPU? Because a CPU - Central processing unit is a specific component that is about 1.25 inches and is underneath a heatsink and fan. It's sort of like referring to an engine as a car. Or the body of a car as the engine.
rbennett83 years ago
Ok im sorry but that's still not the cpu

and whats the power setting have to it ??
thehdp3 years ago
Nice idea and very greate
Dr Qui3 years ago
I notice you did not secure the switch plate to the case, which means you can pop the switch out strip the wires and just twist them together and your in.

You need to hot glue the switch plate in place or use screws so the place cant be puled out or pushed in.
kumaran512 (author)  Dr Qui3 years ago
yeah Qui great tat u ve noticed......but u see the pic, thr is a nut securing the key switch from inside so the switch cant be pulled out or pushed in.........
yes your switch is secured to the plate but unless the plate is fixed to the case it will pop out in seconds and you have access to the wires.
kumaran512 (author)  Dr Qui3 years ago
hi Qui.....the plate is non return press fit type....see the pic of the place both ends.....so it fits firmly to the case.....u can't touch the wires unless u break the plate........or, instead using the plate u can also make a hole in the cabinet case itself fix the switch thr..........
slack-man3 years ago
Good job. A hardware solution such as this is more secure than software for protecting an home or office PC from casual snooping. Someone determined enough would open the case.

It's ironic that this used to be common on the earlier generation PCs, but I havn't seen it for a number of years..
Not bad, just about stop the casual user, but if I really wanted your info the hard drive would be gone in less than 5 minutes, unless you have it locked in a secure enclosure, at which point you just take case and all.

I was a PC tech from 95 -02 I only had a few PC's they user kept locked, It usually turned out that the guy with the locked computer had something grubby secret to hide.

I did use a lockable hard drive caddy from a Fujitsu machine as a hidden safe, my company removed to eliminate the change of some moron removing the drive, yes they where that dumb at times , I could tell some stories lol.
I agree I guess it shows my age , one upon a time every pc came with keys, usually hanging on the back of the case never used LOL
Tkdwn3 years ago
Nice Instructable, But it locks the PC power buton,not the CPU.
I would recommend using truecrypt to secure your data.
pavlus853 years ago
Good work. It's really an interesting idea!
hcaz-3013 years ago
Great idea, but CPU isnt the word your looking for just a computer power lock
Tanmay Das3 years ago
Nice idea, can't believe it didn't occurred to me.